Custom Industrial Zinc Plated Round Neodymium Magnets

Small neodymium magnets are frequently used in products where internal space is tightly controlled.

A round magnet installed inside an electronic housing may appear simple, but even a small dimensional difference can affect the assembly process.

If the disc is too thick, the housing may not close correctly. If the diameter is too large, the magnet may not fit into the designed cavity. If the magnet is too thin, its mechanical strength and magnetic performance may become unsuitable for the application.

For this reason, miniature NdFeB magnets should be selected according to the final product structure rather than magnetic grade alone.

We supply custom small zinc coated neodymium disc magnets for manufacturers working with electronic components, compact mechanical assemblies and precision products.

Diameter, Thickness and Dimensional Tolerance

For small magnets, diameter and thickness must be considered together.

A thin round magnet is not simply a smaller version of a standard disc magnet. Its geometry affects magnetic performance, handling, machining yield and assembly suitability.

Different production processes may also impose limitations on achievable thickness, edge quality and tolerance.

For precision projects, customers should specify:

• Nominal diameter and thickness

• Permitted dimensional tolerance

• Magnetization direction

• Required magnetic grade

• Coating specification

• Assembly method

• Expected order quantity

A dimensional tolerance of ±0.01 mm to ±0.05 mm may be evaluated for selected designs, depending on the magnet size and production process. The achievable tolerance must be confirmed against the drawing before production.

For very thin magnets, additional handling and packaging precautions may be required because sintered NdFeB is a brittle material.

Zinc coating provides a metallic surface finish for suitable NdFeB applications.

On miniature disc magnets, coating thickness is especially relevant because the final external dimensions include the surface treatment.

Therefore, the drawing should clarify whether dimensional requirements apply to the finished coated magnet.

The required coating process should also be compatible with the magnet's dimensions and geometry.

For products operating in humid or corrosive environments, the coating specification requires additional review. Zinc plating alone should not be assumed suitable for all operating conditions.

ample Approval Before Mass Production

For precision components, drawings provide the starting point, but physical verification is often necessary.

Before confirming a large production order, we recommend checking actual samples in the intended product housing.

Key questions include whether the magnet fits without excessive force, whether the magnetic field is appropriate and whether the assembly process risks damaging the coating.

Sample feedback should be consolidated before approving the final production specification.

If the customer uses automated assembly, additional requirements for orientation, presentation and packaging may also need to be discussed.